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On June 20, 2021, another GPS rollover took place. This can have major consequences for your onboard GPS. We would like to tell you more about this in this mailing.
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What is a GPS rollover?
We also speak of a 'GPS week number rollover'. A GPS system has its own GPS time that is expressed in weeks. After 1024 weeks, this counter of the GPS is reset to zero.
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How will this affect me?
Due to this GPS rollover, the time of your GPS device may no longer be correct, but may be 19.7 years in the past. This may cause your GPS device to malfunction. It is also possible that the device itself functions properly, but can no longer send the correct data to external software, such as WinGPS. As a result, your position may not be correct, the GRIB files may not be downloaded for the correct date and the data of the currents and tides may not be visible.
We recommend that you always test your GPS system before you travel. This way you will not be faced with surprises while sailing. |
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What is the solution?
On some GPS devices it is possible to perform an update, so that you have the correct GPS time again. Unfortunately, this is not the case for the (older) commonly used Furuno on-board GPS, for example. See Furuno's message about this here.
In this case you will need a new GPS for on board. For navigation on the laptop, we recommend the popular USB GPS receiver 'BU353s4'.For a good GPS position, a GPS receiver must see at least half of the sky. We therefore recommend the USB GPS receiver 'MR-350' for metal ships. This is because of the longer cable (4.5 meters) and the possibility to mount it with the supplied screws.
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